Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893f57f57e55020…

MALICIOUS

PDF

110.7 KB Created: 2021-01-30 08:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c46e6a5fac86d0b2f74c8ec695786c6 SHA-1: 58b6fb8811e4a8ebaed667ac99675521accc74bf SHA-256: 0893f57f57e55020373c8b54af22833bb91e1038adb39c3e8a0a0bad027c8050
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Phage display antibody service', suggesting a lure to a potentially fraudulent or malicious service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/wb?keyword=phage%20display%20antibody%20service In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5fcba59ec5815.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/jgtJLie/zuladobobuzexulofuv.pdfIn PDF document text
    • http://kismyketio.com/rich_dad_poor_dad_free_downloadzzsr3.pdfIn PDF document text
    • https://fupakedozoj.weebly.com/uploads/1/3/1/4/131407080/1f1b5a10ee8d.pdfIn PDF document text
    • http://demask.space/chauvet-_pro_colordash_accentx1afa.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/76fffe149f.pdfIn PDF document text
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/2866984.pdfIn PDF document text
    • http://reduslimitalia.website/losanudijevawev4zuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_60069e976ed9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_600a3e6994bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fdac0c82d990.pdfIn PDF document text
    • http://amsidgi.xyz/crazy_rich_asians_streaming_vostfr62qo3.pdfIn PDF document text
    • http://shopmzm.site/52533889555vqkje.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/OQHjaja/27089176740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_60021eaa734ec.pdfIn PDF document text
    • https://xonasiwebe.weebly.com/uploads/1/3/0/8/130814782/zanabi-piber-xazubavidinol-webelanu.pdfIn PDF document text
    • https://cdn.sqhk.co/rogekanus/mgdVqgc/trials_frontier_hack_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff4a5004f847.pdfIn PDF document text
    • http://kushtanash.ru/pajugigifosufisetoxotevan7bvo0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F6 5640 bytes
SHA-256: 9a406282d56d772bed8bea19a7cf5736a756d3985b8f221b0c4fcd0b54f8f52e
font_01_sfnt_off00018826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18826 10852 bytes
SHA-256: d1aef2fd0fb2792e535b43d1666491c037e92d98ba98447a3b51747917d645cc

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